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22#include <linux/clk.h>
23#include <linux/err.h>
24#include <linux/gpio.h>
25#include <linux/io.h>
26#include <linux/mmc/host.h>
27#include <linux/module.h>
28#include <linux/of.h>
29#include <linux/of_gpio.h>
30
31#include "sdhci-pltfm.h"
32
33struct sdhci_dove_priv {
34 struct clk *clk;
35 int gpio_cd;
36};
37
38static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)
39{
40 struct sdhci_host *host = data;
41
42 tasklet_schedule(&host->card_tasklet);
43 return IRQ_HANDLED;
44}
45
46static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
47{
48 u16 ret;
49
50 switch (reg) {
51 case SDHCI_HOST_VERSION:
52 case SDHCI_SLOT_INT_STATUS:
53
54 return 0;
55 default:
56 ret = readw(host->ioaddr + reg);
57 }
58 return ret;
59}
60
61static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
62{
63 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
64 struct sdhci_dove_priv *priv = pltfm_host->priv;
65 u32 ret;
66
67 ret = readl(host->ioaddr + reg);
68
69 switch (reg) {
70 case SDHCI_CAPABILITIES:
71
72 ret &= ~SDHCI_CAN_VDD_300;
73 break;
74 case SDHCI_PRESENT_STATE:
75 if (gpio_is_valid(priv->gpio_cd)) {
76 if (gpio_get_value(priv->gpio_cd) == 0)
77 ret |= SDHCI_CARD_PRESENT;
78 else
79 ret &= ~SDHCI_CARD_PRESENT;
80 }
81 break;
82 }
83 return ret;
84}
85
86static const struct sdhci_ops sdhci_dove_ops = {
87 .read_w = sdhci_dove_readw,
88 .read_l = sdhci_dove_readl,
89};
90
91static const struct sdhci_pltfm_data sdhci_dove_pdata = {
92 .ops = &sdhci_dove_ops,
93 .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
94 SDHCI_QUIRK_NO_BUSY_IRQ |
95 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
96 SDHCI_QUIRK_FORCE_DMA |
97 SDHCI_QUIRK_NO_HISPD_BIT,
98};
99
100static int sdhci_dove_probe(struct platform_device *pdev)
101{
102 struct sdhci_host *host;
103 struct sdhci_pltfm_host *pltfm_host;
104 struct sdhci_dove_priv *priv;
105 int ret;
106
107 priv = devm_kzalloc(&pdev->dev, sizeof(struct sdhci_dove_priv),
108 GFP_KERNEL);
109 if (!priv) {
110 dev_err(&pdev->dev, "unable to allocate private data");
111 return -ENOMEM;
112 }
113
114 priv->clk = devm_clk_get(&pdev->dev, NULL);
115
116 if (pdev->dev.of_node) {
117 priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,
118 "cd-gpios", 0);
119 } else {
120 priv->gpio_cd = -EINVAL;
121 }
122
123 if (gpio_is_valid(priv->gpio_cd)) {
124 ret = gpio_request(priv->gpio_cd, "sdhci-cd");
125 if (ret) {
126 dev_err(&pdev->dev, "card detect gpio request failed: %d\n",
127 ret);
128 return ret;
129 }
130 gpio_direction_input(priv->gpio_cd);
131 }
132
133 host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
134 if (IS_ERR(host)) {
135 ret = PTR_ERR(host);
136 goto err_sdhci_pltfm_init;
137 }
138
139 pltfm_host = sdhci_priv(host);
140 pltfm_host->priv = priv;
141
142 if (!IS_ERR(priv->clk))
143 clk_prepare_enable(priv->clk);
144
145 sdhci_get_of_property(pdev);
146
147 ret = sdhci_add_host(host);
148 if (ret)
149 goto err_sdhci_add;
150
151
152
153
154
155 if (gpio_is_valid(priv->gpio_cd)) {
156 ret = request_irq(gpio_to_irq(priv->gpio_cd),
157 sdhci_dove_carddetect_irq,
158 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
159 mmc_hostname(host->mmc), host);
160 if (ret) {
161 dev_err(&pdev->dev, "card detect irq request failed: %d\n",
162 ret);
163 goto err_request_irq;
164 }
165 }
166
167 return 0;
168
169err_request_irq:
170 sdhci_remove_host(host, 0);
171err_sdhci_add:
172 if (!IS_ERR(priv->clk))
173 clk_disable_unprepare(priv->clk);
174 sdhci_pltfm_free(pdev);
175err_sdhci_pltfm_init:
176 if (gpio_is_valid(priv->gpio_cd))
177 gpio_free(priv->gpio_cd);
178 return ret;
179}
180
181static int sdhci_dove_remove(struct platform_device *pdev)
182{
183 struct sdhci_host *host = platform_get_drvdata(pdev);
184 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
185 struct sdhci_dove_priv *priv = pltfm_host->priv;
186
187 sdhci_pltfm_unregister(pdev);
188
189 if (gpio_is_valid(priv->gpio_cd)) {
190 free_irq(gpio_to_irq(priv->gpio_cd), host);
191 gpio_free(priv->gpio_cd);
192 }
193
194 if (!IS_ERR(priv->clk))
195 clk_disable_unprepare(priv->clk);
196
197 return 0;
198}
199
200static const struct of_device_id sdhci_dove_of_match_table[] = {
201 { .compatible = "marvell,dove-sdhci", },
202 {}
203};
204MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
205
206static struct platform_driver sdhci_dove_driver = {
207 .driver = {
208 .name = "sdhci-dove",
209 .owner = THIS_MODULE,
210 .pm = SDHCI_PLTFM_PMOPS,
211 .of_match_table = of_match_ptr(sdhci_dove_of_match_table),
212 },
213 .probe = sdhci_dove_probe,
214 .remove = sdhci_dove_remove,
215};
216
217module_platform_driver(sdhci_dove_driver);
218
219MODULE_DESCRIPTION("SDHCI driver for Dove");
220MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
221 "Mike Rapoport <mike@compulab.co.il>");
222MODULE_LICENSE("GPL v2");
223
